Garden Valley, Idaho has a Humid Continental Climate - Dry Warm Summer climate (Köppen classification: Dsa). Average annual temperatures range from 1.4 °C (low) to 16.9 °C (high). Annual precipitation averages 675.6 Millimeters. Garden Valley is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 2.6 °C | 103.38 mm |
| February | -5.3 °C | 6.3 °C | 72.14 mm |
| March | -2.1 °C | 11.5 °C | 69.6 mm |
| April | 0.6 °C | 15.9 °C | 52.83 mm |
| May | 4.4 °C | 21.2 °C | 51.05 mm |
| June | 7.7 °C | 25.8 °C | 33.02 mm |
| July | 11.1 °C | 32.3 °C | 11.68 mm |
| August | 10.1 °C | 31.8 °C | 9.91 mm |
| September | 5.9 °C | 26.4 °C | 20.32 mm |
| October | 0.9 °C | 17.9 °C | 43.94 mm |
| November | -3.1 °C | 8.2 °C | 82.8 mm |
| December | -6.5 °C | 2.4 °C | 124.97 mm |
| Annual | 1.4 °C | 16.9 °C | 675.64 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsa - Humid Continental Climate - Dry Warm Summer |